RFR: 8351851: Update PmemTest to run on AMD64 [v3]

[duke]

On Thu, 17 Apr 2025 15:49:38 GMT, Ivan Šipka <isipka at openjdk.org> wrote:

>> Remove default OS platform linux x86_64, remove @ignores allowing amd64 as a viable OS platform selection
>
> Ivan Šipka has updated the pull request incrementally with one additional commit since the last revision:
> 
>   retruning ignore directive to other_arch test case

@frkator 
Your change (at version 59209dd4c58c6fa455b7ce621d468fefcf88942b) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/24416#issuecomment-2815048045